In this course we are going to look at advanced
Previously, you learned about some of the basics, like how many NLP problems are just regular machine learning
and data science
problems in disguise, and simple, practical methods like bag-of-words
and term-document matrices
These allowed us to do some pretty cool things, like detect spam
emails, write poetry
, spin articles
, and group together similar words.
In this course I’m going to show you how to do even more awesome things. We’ll learn not just 1, but 4
new architectures in this course.
First up is word2vec
In this course, I’m going to show you exactly how word2vec works, from theory to implementation, and you’ll see that it’s merely the application of skills you already know.
Word2vec is interesting because it magically maps words to a vector space where you can find analogies, like:
- king - man = queen - woman
- France - Paris = England - London
- December - Novemeber = July - June
We are also going to look at the GLoVe
method, which also finds word vectors, but uses a technique called matrix factorization
, which is a popular algorithm for recommender systems
Amazingly, the word vectors produced by GLoVe are just as good as the ones produced by word2vec, and it’s way easier to train.
We will also look at some classical NLP problems, like parts-of-speech tagging
and named entity recognition
, and use recurrent neural networks
to solve them. You’ll see that just about any problem can be solved using neural networks, but you’ll also learn the dangers of having too much complexity.
Lastly, you’ll learn about recursive neural networks
, which finally help us solve the problem of negation in sentiment analysis
. Recursive neural networks exploit the fact that sentences have a tree structure, and we can finally get away from naively using bag-of-words.
All of the materials required for this course can be downloaded and installed for FREE. We will do most of our work in Numpy, Matplotlib, and Theano. I am always available to answer your questions and help you along your data science journey.
This course focuses on "how to build and understand"
, not just "how to use". Anyone can learn to use an API in 15 minutes after reading some documentation. It's not about "remembering facts", it's about "seeing for yourself" via experimentation
. It will teach you how to visualize what's happening in the model internally. If you want more than just a superficial look at machine learning models, this course is for you.
See you in class!
HARD PREREQUISITES / KNOWLEDGE YOU ARE ASSUMED TO HAVE:
- linear algebra
- probability (conditional and joint distributions)
- Python coding: if/else, loops, lists, dicts, sets
- Numpy coding: matrix and vector operations, loading a CSV file
- neural networks and backpropagation
- Can write a feedforward neural network in Theano and TensorFlow
- Can write a recurrent neural network / LSTM / GRU in Theano and TensorFlow
TIPS (for getting through the course):
- Watch it at 2x.
- Take handwritten notes. This will drastically increase your ability to retain the information.
- Write down the equations. If you don't, I guarantee it will just look like gibberish.
- Ask lots of questions on the discussion board. The more the better!
- Realize that most exercises will take you days or weeks to complete.
- Write code yourself, don't just sit there and look at my code.